ISIS' #BostonMarathon tweets show how much ground it's lost on Twitter

ISIS supporters are trying to flood the #BostonMarathon hashtag with threats, and it's not really working.

Like, at all.

The push comes three years after the Boston Marathon bombing. And though Boston's police commissioner has stressed that there have been no credible threats at Monday's marathon, at least one Twitter user called for similar attacks in the future.

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Boston Marathon 2016

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ISIS' #BostonMarathon tweets show how much ground it's lost on Twitter

Apr 18, 2016; Boston, MA, USA; Elite runners make their way along the course during the 2016 Boston Marathon. Mandatory Credit: David Butler II-USA TODAY Sports

HOPKINTON, MA - APRIL 18: A general view as Wave One runners start the 120th Boston Marathon on April 18, 2016 in Hopkinton, Massachusetts. (Photo by Tim Bradbury/Getty Images)

WELLESLEY, MA - APRIL 18: The mobility impaired competitors are cheered on by the Wellesley College students in the Scream Tunnel at Wellesley College along the route of the 120th Boston Marathon in Wellesley, Mass., on April 18, 2016. (Photo by Suzanne Kreiter/The Boston Globe via Getty Images)

WELLESLEY, MA - APRIL 18: A runner is cheered on by the Wellesley College students in the Scream Tunnel at Wellesley College along the route of the 120th Boston Marathon in Wellesley, Mass., on April 18, 2016. (Photo by Suzanne Kreiter/The Boston Globe via Getty Images)

WELLESLEY, MA - APRIL 18: A runner gets high fives from Wellesley College students in the Scream Tunnel at Wellesley College along the route of the 120th Boston Marathon in Wellesley, Mass., on April 18, 2016. (Photo by Suzanne Kreiter/The Boston Globe via Getty Images)

BOSTON, MA - APRIL 18: Tatyana McFadden of the United States crosses the finish line to win the women's push rim wheelchair race during the 120th Boston Marathon on April 18, 2016 in Boston, Massachusetts. (Photo by Maddie Meyer/Getty Images)

BOSTON, MA - APRIL 18: Marcel Hug of Switzerland crosses the finish line to win the men's push rim wheelchair race during the 120th Boston Marathon on April 18, 2016 in Boston, Massachusetts. (Photo by Maddie Meyer/Getty Images)

BOSTON - APRIL 18: Atsede Baysa of Ethiopia crosses the finish line to win the womens race in the the 120th Boston Marathon on Monday, April 18, 2016. (Photo by John Tlumacki/The Boston Globe via Getty Images)

BOSTON - APRIL 18: Lemi Berhanu Hayle of Ethiopia jumps after crossing the finish line to win mens race of the the 120th Boston Marathon on Monday, April 18, 2016. (Photo by John Tlumacki/The Boston Globe via Getty Images)

And before Twitter started cracking down on accounts supporting ISIS, it worked. The group could hijack popular hashtags like it did with the World Cup in 2014.

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ISIS' #BostonMarathon tweets show how much ground it's lost on Twitter

A civilian woman carries her child during a battle with Islamic State militants, east of Mosul, Iraq, January 10, 2017. REUTERS/Azad Lashkari

Civilians walk past Iraqi Special Operations Forces (ISOF) during a battle with Islamic State militants, east of Mosul, Iraq, January 10, 2017. REUTERS/Azad Lashkari

A displaced man, who fled the Islamic State stronghold of Mosul, carries a woman in the Mithaq district of eastern Mosul, Iraq, January 3, 2017. REUTERS/Thaier Al-Sudani TPX IMAGES OF THE DAY

Smoke rises from clashes during a battle with Islamic State militants in the Mithaq district of eastern Mosul, Iraq, January 3, 2017. REUTERS/Thaier Al-Sudani

An Iraqi soldier is seen during a battle with Islamic State militants, north of Mosul, Iraq, December 30, 2016. REUTERS/Khalid al Mousily

Iraqi people flee the Islamic State stronghold in the town of Bartella, east of Mosul, December 28, 2016. REUTERS/Ammar Awad TPX IMAGES OF THE DAY

Iraqi people flee the Islamic State stronghold in the town of Bartella, east of Mosul, December 28, 2016. REUTERS/Ammar Awad

Iraqi rapid response forces cook food in their headquarters during the war against the Islamic state militants east of Mosul, Iraq, December 21, 2016. REUTERS/Khalid al Mousily

Mohammad Hassan, whose hand was chopped off by Islamic State militants, sits outside a house at Nimrud village, south of Mosul, Iraq, December 13, 2016. Picture taken December 13, 2016. REUTERS/Mohammed Salem

Displaced Iraqi boys, who fled the Islamic State stronghold of Mosul, warm themselves by a fire in Khazer camp, Iraq,December 15, 2016.REUTERS/Ammar Awad

Displaced Iraqi woman, who fled the Islamic State stronghold of Mosul, bids her relatives farewell as she leave Khazer camp to go home, Iraq December 10, 2016.REUTERS/Ammar Awad

Iraqi Christians come to visit the heavily damaged Church of the Immaculate Conception after Iraqi forces recaptured it from Islamic State in Qaraqosh, near Mosul, Iraq, December 9, 2016. REUTERS/Ammar Awad

An Iraqi father (L) mourns the death of his son, who was killed during clashes in the Islamic State stronghold of Mosul, in al-Samah neighborhood, Iraq December 1, 2016. REUTERS/Mohammed Salem

An Iraqi girl, who was wounded during clashes in the Islamic State stronghold of Mosul, lies on a bed at a field hospital in al-Samah neighborhood, Iraq December 1, 2016. REUTERS/Mohammed Salem

Displaced people who fled the clashes transfer to camps during a battle with Islamic State militants in Mosul, Iraq, November 30, 2016 REUTERS/Alaa Al-Marjani

A member of the Iraqi Special Operations Forces (ISOF) gestures in military vehicle during a battle with Islamic State militants in Mosul, Iraq, November 30, 2016 REUTERS/Alaa Al-Marjani TPX IMAGES OF THE DAY

A man gestures as other men sit on the ground as an Iraqi Special forces intelligence team check their ID cards as they search for Islamic State fighters in Mosul, Iraq November 27, 2016. REUTERS/Goran Tomasevic

Two men hold hands as an Iraqi Special forces intelligence team searches for Islamic State fighters in Mosul, Iraq November 27, 2016. REUTERS/Goran Tomasevic

Oilfields burned by Islamic State fighters are seen in Qayyara, south of Mosul, Iraq November 23, 2016. REUTERS/Goran Tomasevic TPX IMAGES OF THE DAY

Boys stand in front of oilfields burned by Islamic State fighters in Qayyara, south of Mosul, Iraq November 23, 2016. REUTERS/Goran Tomasevic

Civilians flee fighting between Iraqi forces and Islamic State fighters in Mosul, Iraq, November 20, 2016. REUTERS/Goran Tomasevic TPX IMAGES OF THE DAY

Smoke rises from clashes during a battle with Islamic State militants at the airport of Tal Afar west of Mosul, Iraq November 18, 2016. REUTERS/Thaier Al-Sudani

A member of Shi'ite fighters carries a weapon during a battle with Islamic State militants at the airport of Tal Afar west of Mosul, Iraq November 18, 2016. REUTERS/Thaier Al-Sudani

A displaced woman from the outskirts of Mosul covers herself in a blanket in the town of Bashiqa, after it was recaptured from the Islamic State, east of Mosul, Iraq, November 18, 2016. REUTERS/Khalid al Mousily

A girl attends classes after the city was recaptured from the Islamic State militants in Qayyara, Iraq, November 17, 2016. REUTERS/Ari Jalal

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But then Twitter started suspending ISIS-related accounts more aggressively, and suddenly it became much harder for the group's gruesome propaganda to find its way into an unrelated hashtag.

The #BostonMarathon tweet that called for more attacks, for example, has already been deleted.

ISIS supporters are nothing if not persistent, though -- one propagandist has suspended and recreated almost 500 accounts.